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boot: the /system tree is the system image — loader-built ramdisk, spawn by path

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Retire the build-time ramdisk packer and the packed initial-ramdisk.img.
make-fat-image.py now lays every user binary out at its FHS path on the
boot volume (system/services, system/drivers, system/tests), and the EFI
loader walks \system at boot, packing what it finds into an in-RAM v2
initial_ramdisk whose entry names are full FHS paths. init rides the
table like every other binary: its dedicated handoff fields are gone and
the kernel spawns PID 1 via the same lookup as everyone else
(process.spawnBundled).

system_spawn resolves names by exact path first, then unique basename,
and normalizes argv[0] to the stored path — so task names (and, next,
the tagged log ring's attribution) are honest binary paths everywhere.
initrd v2 rejects the old magic so a stale image fails loudly.

Groundwork for per-process logging (/var/log/<boot-stamp>/<binary-path>.log)
and the kernel-VFS /system mount.
This commit is contained in:
Daniel Samson
2026-07-21 14:47:26 +01:00
parent ec6e888076
commit 2d0858caf6
11 changed files with 413 additions and 324 deletions
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system/kernel/kernel.zig
+10 -14
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@@ -329,20 +329,16 @@ fn kmain(boot_information: *const BootInformation) noreturn {
// service supervisor and the device manager spawns the drivers it discovers.
publishInitialRamdisk(boot_information);
// Hand over to user space: load /system/services/init (read off the boot volume by
// the loader) and spawn it as a real ring-3 process, PID 1. As the supervisor it
// brings up the system services (the VFS server, the device manager); the device
// manager then discovers the hardware and spawns each driver. init runs on its own
// address space, preemptively — this boot context becomes the BSP's idle loop.
if (boot_information.init_len != 0) {
status("/system/kernel: starting /system/services/init...\n");
const image = @as([*]const u8, @ptrFromInt(boot_handoff.physicalToVirtual(boot_information.init_base)))[0..boot_information.init_len];
process.spawnProcess(image, 4, &.{"/system/services/init"}) catch |err| {
statusPrint("/system/kernel: /system/services/init failed to load: {s}\n", .{@errorName(err)});
};
} else {
status("no /system/services/init on the boot volume.\n");
}
// Hand over to user space: spawn /system/services/init out of the ramdisk as a
// real ring-3 process, PID 1 — it rides the same table as every other binary.
// As the supervisor it brings up the system services (the VFS server, the device
// manager); the device manager then discovers the hardware and spawns each
// driver. init runs on its own address space, preemptively — this boot context
// becomes the BSP's idle loop.
status("/system/kernel: starting /system/services/init...\n");
process.spawnBundled("/system/services/init") catch |err| {
statusPrint("/system/kernel: /system/services/init failed to start: {s}\n", .{@errorName(err)});
};
// Become the idle task: drop below every real task and halt until an
// interrupt. The timer keeps preempting into init and any other work.